Precession

Precession
Precession Pre*ces"sion, n. [L. praecedere, praecessum, to go before: cf. F. pr['e]cession. See {Precede}.] The act of going before, or forward. [1913 Webster]

{Lunisolar precession}. (Astron.) See under {Lunisolar}.

{Planetary precession}, that part of the precession of the equinoxes which depends on the action of the planets alone.

{Precession of the equinoxes} (Astron.), the slow backward motion of the equinoctial points along the ecliptic, at the rate of 50.2[sec] annually, caused by the action of the sun, moon, and planets, upon the protuberant matter about the earth's equator, in connection with its diurnal rotation; -- so called because either equinox, owing to its westerly motion, comes to the meridian sooner each day than the point it would have occupied without the motion of precession, and thus precedes that point continually with reference to the time of transit and motion. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Precession — Précession Précession d un gyroscope La précession est le nom donné au changement graduel d orientation de l axe de rotation d un objet ou, de façon plus générale, d un vecteur sous l action de l environnement, par exemple, quand un couple lui… …   Wikipédia en Français

  • Précession — d un gyroscope La précession est le nom donné au changement graduel d orientation de l axe de rotation d un objet ou, de façon plus générale, d un vecteur sous l action de l environnement, par exemple, quand un couple lui est appliqué. Ce… …   Wikipédia en Français

  • précession — [ presesjɔ̃ ] n. f. • 1690; lat. tardif præcessio ♦ Mouvement de rotation autour d un axe fixe, de l axe d un gyroscope. ♢ Mouvement analogue de l axe de rotation terrestre autour d une position moyenne de cet axe. Vitesse de précession : vitesse …   Encyclopédie Universelle

  • precession — [prē sesh′ən, prisesh′ən] n. [ME < LL praecessio < L praecedere, to PRECEDE] 1. the act of preceding; precedence 2. Astronomy short for PRECESSION OF THE EQUINOXES 3. Mech. an effect exhibited by a spinning body, as a top, when an applied… …   English World dictionary

  • precession — precession. См. прецессия. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • precession — (n.) 1590s, from L.L. praecissionem (nom. praecissio) a coming before, from pp. stem of L. praecedere (see PRECEDE (Cf. precede)). Originally used of calculations of the equinoxes, which come slightly earlier each year …   Etymology dictionary

  • precession — ► NOUN 1) the slow movement of the axis of a spinning body around another axis. 2) Astronomy the slow retrograde motion of the equinoctial points along the ecliptic, resulting in the earlier occurrence of equinoxes each year. DERIVATIVES precess… …   English terms dictionary

  • Precession — For other uses, see Precession (disambiguation). Precession of a gyroscope Precession is a change in the orientation of the rotation axis of a rotating body. It can be defined as a change in direction of the rotation axis in which the second… …   Wikipedia

  • precession — precessional, adj. /pree sesh euhn/, n. 1. the act or fact of preceding; precedence. 2. Mech. the motion of the rotation axis of a rigid body, as a spinning top, when a disturbing torque is applied while the body is rotating such that the… …   Universalium

  • précession — (pré sè ssion) s. f. Terme d astronomie. Précession des équinoxes, mouvement rétrograde des points équinoxiaux. •   Il [Newton] trouve par une méthode dont on ne saurait trop admirer la finesse, que la précession annuelle des équinoxes doit être… …   Dictionnaire de la Langue Française d'Émile Littré

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